The X-rays diffraction with crystal was first studied by: W.H Bragg
Boher proposed his atomic model in: 1913
Disintegration of photon on striking a nucleus into an electron and positron is known as: Pair production
The temperature of core of nuclear reactor is: 1200°C
The 1st Bohr atom in the hydrogen atom has radius: 5.30 x 10-11 m
The numerical value of Compton wavelength is equal to: 2.43 x 10<sup>-12</sup>m
Electron volt is unit of: Nuclear energy
In according with Bohr’s theory the K.E of the electron is equal to: ke2/2r
Compton shift is maximum for scattering angle of photon: 90<sup>o</sup>
Life time of metastable states is: 10-3 sec or more
In the Bohr’s model of the hydrogen atom, the lowest orbit corresponds to: Minimum energy
The energy of the photon of wavelength 500 nm is: 2.49 eV
The typical nuclei are less than: 10-14m
The first theory about the structure of an atom was introduced by: Rutherford
If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be: 5 V
The series in infrared region is: Bracket series
If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is: 3.4 eV
The unit of Plank’s constant ‘h’ is: JS
When an electron in an atom goes from a lower to higher orbit its: K.E increases , P.E decreases
A° is the unit of: Length
The process by which lesser beam can be used to generate 3-dimensional images of objects is called: Holography
Einstein was awarded Nobel prize in physics in: 1921
Energy produced due to fission of uranium atom is: 200MeV
Charge on positron is: Positive
Study of hydrogen visible spectrum in: 1885
Antiparticle of electron is: Positron
The value of Rydberg constant is: 1.0974 x 107 m-1
Reflecting mirrors in laser is used to: Further stimulation
For an atom of hydrogen atom the radius of the first orbit is given by: h2/4
X-rays were discovered by: Rontgen
The Balmer series is obtained when all the transition of electrons terminate on: 2nd orbit
An atom can reside in excited state for: 10-8 second
Target material used in x-rays tube have following properties: High atomic number and high melting pouint
The radius of hydrogen atom is: 0.53A°
The first spectral lines were discovered in 1885, were: Balmer series
The value of Rydberg constant is: 1.0974 x 107 m-1
If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be: 13.6 volt
The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is: 1958
1 rem =: 0.01 SV
The series in visible region is: Balmer series
The velocity of electron moving is 1st orbit of hydrogen atom is: 2.19 x 106 ms-1
1 rad =: 0.01Gy
Charge on an atom is: Neutral
Black Body radiation spectrum is an example of: Continuous spectra
Helium-Neon laser discharge tube contains neon: 15%